Contour grinder tool



Jan. 12, 1943. F. L. LE Bus ,30 ,1 2

CONTOUR GRINDER TOOL Filed March 13, 1942 flan/ litz Zfizzs Y INVENTOR.

Patented Jan. 12, 1943 I i UNITED STATES CONTOUR GRINDER TOOL Franklin L. Le Bus, Longview, Tex.

Application March 13, 1942, Serial No. 434,493

3 Claims.

This invention relates to grinding devices and more particularly to such devices designed to produce curved working faces on machine parts which rotate about their axes, such as gears, sprockets, cams and the like.

The particular object of the invention is to provide a contour grinding device in which the essential elements are simple and inexpensive to build, wherein the maximum grinding wheel surface is attained, and wherein the alignment of the grinding wheel and the contour is easy to maintain.

The invention includes other objects, such as gauging the contour with a straight edge, means for preventing undesirable rotation of the contours, and other and further advantages which will become apparent from the following detailed description, taken in connection with the accompanying drawing, and in the drawing:

Figure 1 is an end elevational view of the complete grinding device;

Figure 2 is a top plan view of Figure 1, with part broken away, the view being shown partly in horizontal section taken along the line 2-2 of Figure 1; and

Figure 3 is a detail view of the power side of the device, in part, as shown in Figure 2, illustrating the grinding wheel, contour follower bars, frame and slide block.

In carrying out the invention, there is provided a base I with spaced supports 2 and 3, the base including lugs 4 with holes 5 for securing the base in a rigid position.

A mandrel 6 with hollow core I and having on one end a hub I and a flange l and having on its opposite end a hub 8 with disk 9 constitute part of the mandrel assembly. The remaining parts are the disks l0 and II formed integrally with the hubs l2 and I3. The ends of the mandrel at B (see Figure l) are seated in the ends of the supports 2 and 3.

Secured to the disk 9 is a master contour l4, the contour and disk being provided with annularly spaced holes l6 for insertion of the rods Hi In this manner, when the holes in the disk 9 are in register with those in the contour I4, rods IS in connection with nuts l'l, hold the contour M in position. This arrangement also provides a means for supporting spacer roller elements I8 on the rods which spacers serve to hold the contour and work in proper alignment. The rods l6 also extend to a second master contour IS with holes spaced therearound as in the contour 14 and this contour I9 is secured to position in like manner to the flange 1*.

In Figure 2, the work, in this instance two sprockets shown at 20 and 2|, are in position to be ground to the same shape as the contours l4 and 19. These sprockets are thus supported on the mandrel 6 by the disks l0 and Il.

The device includes a grinder wheel shown at 22, a contour follower frame 23, and two follower bars 24 and 25. By means of the frame the contour bars and the periphery or outer circumference of the grinder wheel are maintained on a common center line.

Also included in the frame 23 is a slot 25 for a slide block 21, having an adjustable screw 28 to provide adjustments for compensation in wheel wear.

On the base I are two spaced supports 29 and 30, these supports being secured to a shaft 3| by means of the pins 3H, the shaft having its ends pivotally seated in the pillow blocks 32 and 33, which permits these supports to be swung to desired positions. Slots 34 in the ends of the supports hold the follower bars 24 and 2'5 in the same relative positions on the two master contours, but permit the follower bars to move along the contours lengthwise and to rotate in the slots.

A block 35 prevents undesirable rotation of the contours.

The grinder wheel 22 is carried on a shaft 36 l in a tubular housing 31 and powered by a motor 38.

From the foregoing it should be apparent that the device constructed as described with two master contours eliminates the necessity for complicated grinder carriage mounting, and that rotation of the grinder carriage about the axis of the follower bars provides for more use of grinder wheel surface, It will be also apparent that this construction and operation maintains wheel radius with fewer dressings, that the ground face of the work, when finished, is in a straight line with the faces of the master contours. I

While the disclosure presents a practical working embodiment of the invention it should be understood that many variations of arrangement are possible, as for instance the work need not necessarily be mounted between the master contours, but may be secured to one end of the contour-work assembly, in which case the contour follower bars would consist of one piece instead of two, and mechanical power could be applied to produce any or all of the operating motions of the grinder device.

What is claimed is:

1. A contour grinding device comprising a mandrel, a master contour mounted at each end of the mandrel, a grinding wheel with frame and follower bars, means for maintaining the periphery of the grinding wheel in line with the contact surface of the follower bars, and means for supporting material to be ground on the mandrel and in proper alignment with the master contours to permit the material and contours to be moved and/0r rotated together to facilitate application of the grinding wheel.

2. A contour grinding device comprising a base, a mandrel, uprights on the base for rotatably supporting the mandrel above the base, a master contour at each end of the mandrel, spacers between the master contours for holding the contours and material to be worked in proper alignment, a grinding wheel, a contour follower frame and follower bars associated with the grinder Wheel and including an adjustable slide block, and means for controlling rotation of the grinding wheel.

3. A contour grinding device comprising a base, a mandrel having hub portions with flanges and disks thereon, a master contour removably secured to the flange at one end of the mandrel,

a master contour removably secured to the disk FRANKLIN L. LE BUS. 

